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Long-term variability of the temperature time series recorded in Lisbon

Author

Listed:
  • Joao Santos
  • Solange Leite

Abstract

As a case study for application in climate change studies, daily air temperature records in Lisbon are analysed by applying advanced statistical methodologies that take into account the dynamic nature of climate. A trend analysis based on two non-parametric tests (Spearman and Mann-Kendall) revealed the presence of statistically significant upward trends in the maximum temperatures, mainly during March. The minimum temperatures do not present significant trends, with the exception of March where a relatively weak positive trend is detected. A singular spectral analysis combined with a maximum entropy spectral analysis enables the detection of regularities in the annual mean time series of the maximum and minimum temperatures. A quasi-periodic oscillation with a peak period of about 50 years is superimposed in the linear trends. At the maximum temperature, a secondary oscillation with a peak period of nearly 20 years is also identified. No other regularities are isolated in these time series. The study is enhanced by applying an extreme value analysis to the extreme winter and summer temperatures. The generalized extreme value distribution family is shown to provide high-quality adjustments to the distributions, and a description of the temperatures related to different return periods and risks is given.

Suggested Citation

  • Joao Santos & Solange Leite, 2009. "Long-term variability of the temperature time series recorded in Lisbon," Journal of Applied Statistics, Taylor & Francis Journals, vol. 36(3), pages 323-337.
    • Handle: RePEc:taf:japsta:v:36:y:2009:i:3:p:323-337
    DOI: 10.1080/02664760802449159
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    Cited by:

    1. María N Lorenzo & Alexandre M Ramos & Juan J Taboada & Luis Gimeno, 2011. "Changes in Present and Future Circulation Types Frequency in Northwest Iberian Peninsula," PLOS ONE, Public Library of Science, vol. 6(1), pages 1-9, January.

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